Improvement in circular-saw mills



UNTTED STATES PATENT OFFICE.

IMPROVEMENT IN CIRCULAR-SAW MILLS.

Specification forming part of Letters Patent No. 116,625, dated July 4, 1871.

To all whom it may concern:

Be it known that I, SAMUEL M. PALMER, of Glens Falls, in the county of Warren and State of New York, have invented a new and useful Improvement in Circular Gang-Saw Mills 5 and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specifica-tion, in which- Figure l is a side view of my improved niachine. Fig. 2 is a top view of the saine, part of one of the driving-pulleys being broken away to show the construction.

Similar letters of reference indicate corresponding parts.

My invention has for its object to improve the construction of circular gang-saw mills so as to p make them more convenient in use, more effective in operation, more ez sily manuiulated, and

more readily adjusted to feed faster or slower; and it consists in the construction and combination of va-rious parts of the machine, as hereinafter more fully described.

A is the frame-work of the machine. B is the mandrel, to which the gang of circular saws U are detachably attached in the ordinary manner, and which revolves in bearings attached to the frame A. To each end of the mandrel B is attached a pulley, Il), one or both of which is detach ably attached tothe said mandrel by means of a screw-thread cutupon the said mandrel, and upon the inner surface of the said pulley, as shown in Fig. 2, or in any other convenient inanner, so that the said pulley or pulleys can be readily removed when required to enable the saws C to be detached from said mandrel. By this arrangement the saws are driven by power applied to both ends ofthe mandrel instead of by power applied to only one end, is the usual construction. `E are the lower feed-rollers, which I prefer to make grooved, and the journals of which revolve in bearings attached to the frame A. To the projecting ends of the journals of the feedrollers E are attached gear-wheels F. The teeth of the two gear-wheels F, upon each side of the saws C, mesh into the teeth of a gear-wheel, G, which runs loosely upon a gudgeon attached vto the frame A, and is placed below and midway between said two gear-wheels, F. The teeth of the inner gear-wheel of each pair F mesh into the teeth of a gear-wheel, I-I, which revolves loosely upon a gudgeon attached to the frame A. The teeth of the two gear-wheels H mesh into the teeth of the same gear-wheel I, which works loosely up n a gudgeon attached to the fra-me A.

Upon the gear-wheel I is formed, or with it is ri idly connected, a bevel-gear wheel, J, into the teeth of which mesh the teeth of the bevel-gear wheel K attached to the inner end of the shaft L, which revolves in bearings in arms or brackets M attached to the f ame A. Upon the shaft L, near its outer end, is placed a friction-wheel, N, which is connected with said shaft L by a tongue and groove or by other well-known means, so that it may ca-rry the said shaft with it in its revolution, and at the same time may slide freely upon it. The end of the hub of the friction-wheel N is grooved to receive the lever, by which it is moved back and forth along the shaft L, said lever not being shownin the drawing. The face of the frictioirwheel N may be made plain or grooved, and may have al rubber band, a', placed upon it, if desired. The face of the friction-wheel N rests against the smooth side of the disk O, and is revolved by the revolution of said disk. By moving the friction-wheel N toward or from the axis ofthe disk O the feed maybe slowed or quickeneiil, as may be desired, or as the character of the work may require. The friction-disk O is attached to the end of the shaft I), which revolves in bearings attached to the frame A, and to the other end of which is attached a pulley, Q. Around the pulley Q, passes a belt, It, which also passes around the pulley S attached to the mandrel B. By this construction, should the feed-rollers encounter any obstruction, the frictiondisk 0 will slide upon the friction-wheel N until the machine can be stopped, thus guarding against breakage of the feed mechanism. T are the upper feed-rollers, the -journals of which revolve in bearings in the upper ends of the upi rights U, which pass through and move up and down in holes in the arms or brackets V attached to or formed upon the frame A. The lower ends of the four uprights U are securely attached to the four corners of the rigid frame 7, which is made suiiciently heavy to hold the upper feedrollers T down upon the timber with the necessary force. The lrame W is raised to raise the upper feed-rollers T away from the timber, when required, by n, double inoline pushed beneath it described for operating the saine, all constructed by ay lever, or by any other convenient means. and arranged as and for the purpose specified.

Having thus described my invention, what I The labove specification of my invention signed elitiin as new, and desire to secure by Letters by me this lst dey of April, 1871.

Patent, is SAMUEL M. ALMER.

A gang-saw shaft, having a pulley, D, at each Vitnesses: end, A(ind the feed-rolls E T located as described, JAMES T. GRAHAM,

combined With the mechanism herein shown and T. B. MOSHER. 

